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參數(shù)資料
| 型號： | LTC4000IUFD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC28 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220WXXX-X, QFN-28 |
| 文件頁數(shù)： | 40/40頁 |
| 文件大?。?/td> | 428K |
| 代理商： | LTC4000IUFD#PBF |
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LTC4000
9
4000f
pin FuncTions (QFN/SSOP)
CL(Pin8/Pin4):ChargeCurrentLimitProgramming.Con-
nectthechargecurrentprogrammingresistor(RCL)tothis
pin. This pin sources 50A of current. The regulation loop
compares the voltage on this pin with the charge current
monitor voltage (VIBMON), and drives the ITH pin accord-
ingly to ensure that the programmed charge current limit
is not exceeded. The charge current limit is determined
using the following formula:
ICLIM = 2.5A
RCL
RCS
Where RCS is the sense resistor connected to the CSP
and the CSN pins. Leave the pin open for the maximum
charge current limit of 50mV/RCS.
TMR (Pin 9/Pin 5): Charge Timer. Attach 1nF of external
capacitance(CTMR)toGNDforeach104secondsofcharge
termination time and 26 seconds of bad battery indicator
time. Short to GND to prevent bad battery indicator time
and charge termination time from expiring – allowing a
continuous trickle charge and top off float voltage regula-
tion charge. Short to BIAS to disable bad battery detect
and enable C/X charging termination.
GND (Pins 10, 28, 29/Pins 6, 24): Device Ground Pins.
Connect the ground pins to a suitable PCB copper ground
plane for proper electrical operation. The QFN package
exposed pad must be soldered to PCB ground for rated
thermal performance.
FLT, CHRG (Pin 11, Pin 12/Pin 7, Pin 8): Charge Status
Indicator Pins. These pins are high voltage open drain pull
down pins. The FLT pin pulls down when there is an under
or over temperature condition during charging or when
the voltage on the BFB pin stays below the low battery
threshold during charging for a period longer than the bad
battery indicator time. The CHRG pin pulls down during
a charging cycle. Please refer to the application informa-
tion section for details on specific modes indicated by the
combination of the states of these two pins. Pull up each
of these pins with an LED in series with a resistor to a
voltage source to provide a visual status indicator. Short
these pins to GND when not used.
BIAS (Pin 13/Pin 9): 2.9V Regulator Output. Connect a
capacitor of at least 470nF to bypass this 2.9V regulated
voltage output. Use this pin to bias the resistor divider to
set up the voltage at the NTC pin.
NTC (Pin 14/Pin 10): Thermistor Input. Connect a ther-
mistor from NTC to GND, and a corresponding resistor
from BIAS to NTC. The voltage level on this pin determines
if the battery temperature is safe for charging. The charge
current and charge timer are suspended if the thermistor
indicatesatemperaturethatisunsafeforcharging.Oncethe
temperature returns to the safe region, charging resumes.
Leave the pin open or connected to a capacitor to disable
the temperature qualified charging function.
FBG (Pin 15/Pin 11): Feedback Ground Pin. This is the
ground return pin for the resistor dividers connected to
the BFB and OFB pins. As soon as the voltage at IN is valid
(>3Vtypical),thispinhasa100ΩresistancetoGND.When
the voltage at IN is not valid, this pin is disconnected from
GND to ensure that the resistor dividers connected to the
BFB and OFB pins do not continue to drain the battery
when the battery is the only available power source.
BFB (Pin 16/Pin 12): Battery Feedback Voltage Pin. This
pin is a high impedance input pin used to sense the battery
voltage level. In regulation, the battery float voltage loop
sets the voltage on this pin to 1.136V (typical). Connect
this pin to the center node of a resistor divider between
the BAT pin and the FBG pin to set the battery float voltage.
The battery float voltage can then be obtained as follows:
VFLOAT =
RBFB2 +RBFB1
RBFB2
1.136V
BAT (Pin 17/Pin 13): Battery Pack Connection. Connect
the battery to this pin. This pin is the anode of the battery
ideal diode driver (the cathode is the CSN pin).
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| LTC4001 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2A Synchronous Buck Li-Ion Charger |
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| LTC4001EUF#PBF | 功能描述:IC CHARGER LI-ION BUCK 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學:鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| LTC4001EUF#TRPBF | 功能描述:IC CHARGER LI-ION BUCK 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
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